Lock for typewriter desks



Oct. 20, 1953 c. w. KOCH LOCK FOR TYPEWRITER DESKS Filed Sept. 29, 19492 Sheets-Sheet l ATTORNEY.

x w, M m F v I w W y Oct. 20, 1953 c. w. KOCH LOCK FOR TYPEWRITER DESKSFiled Sept. 29, 1949 2 Sheets-Sheet 2 INVENTORI CLARENCE W. KocH A 6.\%w w m m .ulllll llll w ATTORNEY.

Patented Oct. 20, 1953 UNITED STATES ATENT OFFICE This invention relatesto typewriter desks and in its more specific aspects is directed to animproved lock for holding the platform on which the typewriter rests inan elevated position.

The primary object of the invention is to provide a lock for thetypewriter platform in a desk that will be easily operated, will respondto gravitational action for its operation and which can be released by asimple lever action thus permitting the platform to be raised or loweredin the customary manner.

Another object of the invention is to provide a spring operated lock fora typewriter desk platformthat secures the same to the desk frame whenthe platform is in its elevated position but which will respond togravitational action for locking the platform in position in the eventof failure of the spring.

. The invention consists in the provision of a lock for a typewriterdesk platform which will lock the latter rigidly to the desk frame whenit is in its elevated position and which is appliable either by a springor gravitational action and which can Fig. 1 is a partial verticalsection view through a typewriter desk showing the platform therefor indepressed position and disposed in the well Y of the desk;

Fig. 2 is a view similar to Fig. 1 but with the platform in positionjust prior to vertical movement;

Fig. 3 is a. view similar to Fig. 2 but with the platform in lockedelevated position;

Fig. 4 is a plan view of the platform lock;

Fig. 5 is a partial sectional elevational view of the look as applied tothe desk;

Fig, 6 is an enlarged section view of thelock in engaged position takenalong the line fi6 of Fig. 3;

Fig. 7 is a section view taken along the line 1-1 of Fig. 3; and

Fig. 8 is a section view taken along the line 88 of Fig. 4.

This invention is an improvement on the disclosure in U. S. Patent No.2,402,412 issued to the inventor hereof. This invention is embodied in adesk generally designated by the numeral I and is provided with a well 2in which the typewriter platform 3 and its carriage are disposed. A door5 normally closes the open end of the well 2 in the customary manner.

A track 6 for the carriage 4 is disposed in the well 2 and is secured tothe side walls of the desk that form the well. Only one of the trackrails is shown although there are two provided as is customary in theart, The complete details of the carriage are setforth in theaboveidentified patent. r

I The platform 3 is supported on each of the carriages by a pair oflevers I one end of each being pivoted to the carriage on pins 8disposed in substantially vertical alignment and the opposite ends ofthe levers are pivotally secured to a bracket 9, one being secured toeach side of the plat-- form 3 by means of pins I0, these pins alsobeing in substantial vertical alignment. A spring I I is disposedbetween a rod I2 connected between the carriages and a rod I3 connectedbetween the lower of the levers I, the Spring acting as a counterbalancefor the platform 3, and the typewriter thereon, when it is moved fromlowered to elevated position. Each carriage has a lever I4 pivotedthereto having an arm I5 thereon that engages a notch I6 for holding thecarriage 4 in position when it is in its outermost position as morefully set forth in the above identified patent. A spring II connectedbetween the lever I4 and the carriage 4 holds the lever I4 and itsextension or arm I5 in locked position when the carriage is withdrawnfrom the well 2.

Each bracket 9 has an extension I8 thereon that is engaged by a rod I9received in angularly disposed slots 20 in brackets 2| secured to thedesk frame. The rod I9 slides down the slots 20 against extension I8thereby locking the platform in position and rigidly to the desk. Aspring 22 in addition to gravitational action normally urges the rod I9doownwardly into positive engagement with the extension I8. The spring22 is connected between rod I9 and a pin or screw in brackets 2I. Alever 23 pivotally secured to the platform 3 may be depressed forreleasing the rod I9 from the extension I8. This lever lifts the rodupwardly in the slot and away from the extension I8. Should spring 22fail gravitational action will cause it to engage said extension I8 andif so, it is released in the same manner as when spring operated.

That which is regarded as new, novel and useful and which is sought tobe protected by Letters Patent of the United States is as follows:

1. A typewriter desk comprising a frame; a carriage longitudinallymovable in said frame between innermost and outermost positions relativeto the desk; a platform having brackets thereon, each bracket providedwith an extension; means extending between said carriage and saidbrackets for permitting said platform to move substantially verticallyto an elevated position when withdrawn from said frame; a locking memberfor securing said carriage relative to said frame in said outermostposition; a locking bar supported by said frame and adapted to engagesaid extensions in said outermost position of said carriage for lockingsaid platform to said frame in said elevated position; a spring forholding said bar in looking engagement with said extensions; and a levermounted on said platform for releasing said locking bar from saidextensions thereby permitting said platform to move substantiallyvertically.

2. A typewriter desk comprising a frame; a carriage movable in saidframe between innermost and outermost positions relative to the desk; aplatform having brackets thereon, each bracket provided With anextension; means extending between said carriage and said brackets forpermitting said platform to move substantially vertically to an elevatedposition when withdrawn from said frame; a locking member for securingsaid carriage relative to said frame in said outermost position; alocking bar supported by said frame and adapted to be engaged by saidextensions in said outermost position of said carriage for locking saidplatform to said frame in said elevated position and locked against saidextensions by gravitational action; and a lever mounted on said platformfor releasing said locking bar from said extensions thereby permittingsaid platform to move substantially vertically.

3. A typewriter desk comprising a frame; a carriag movably supported insaid frame and having an outermost position relative to the desk;releasable means on said carriage for holding said carriage in saidoutermost position; a platform; means for pivotally securing saidplatform tosaid carriage, said platform moving between lowered andelevated positions relative to said carriage; a locking bar having alength substantially equal to the Width of said platform; means mountedon said frame receiving said bar and permitting. it to move bygravitational action toward the platform; means mounted on said platformand located, when. said platform is in said elevated position, to beengaged by said bar for locking the platform to the frame cooperationwith said releasable means; and a manually a actuated. lever pivotallysupported on said. platform engageable with said locking bar and adaptedto lift the bar from the platform mounted means to thereby release thelocking engagement of said bar from the platform mounted means.

4. A typewriter desk comprising a frame and having an outermost positionrelative to the desk; releasable means on said carriage for holding saidcarriage in said outermost position; a carriage movable in said frame; aplatform; means for pivoting said. platform. to said. carriage formovement to an elevated position in the outermost position of saidcarriage, said means including brackets having extensions thereonmovable into exposed positions upon pivoting of said platform to saidelevated position; a locking bar mounted on said frame for movementtoward and away from said exposed extensions for engagement therewith; aspring for moving said bar into contact with said extensions for lockingthe platform to said frame; and manually actuated lever means on saidplatform adapted for disengaging said locking bar from said extensionsto release said platform from said frame for movement out of saidelevated position.

5. A typewriter desk comprising a frame; a carriage movable relative tosaid frame between innermost and outermost positions; a platform; meansfor pivotally suspending said platform from said carriage includingbrackets, each bracket having an extension thereon; a lever member forsecuring said carriage relative to said frame in said outermostposition; a locking bar mounted on said frame and having a lengthsubstantially equal to the width of said platform, said bar beingresponsive to gravitational action adapted for engagement with each ofsaid extensions in said outermost position of said car-- riage forlocking said platform to said. frame; and a lever engageable with said.locking bar for releasing it from said extensions and said platform fromsaid frame;

CLARENCE W. KOCH.

References Cited in the file of this patent UNITED STATES PATENTS

